21211303203 has 48 divisors (see below), whose sum is σ = 31761306720. Its totient is φ = 13632192000.

The previous prime is 21211303187. The next prime is 21211303229. The reversal of 21211303203 is 30230311212.

21211303203 is a `hidden beast` number, since 212 + 1 + 130 + 320 + 3 = 666.

It is not a de Polignac number, because 21211303203 - 2⁴ = 21211303187 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21211303103) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16454983 + ... + 16456271.

It is an arithmetic number, because the mean of its divisors is an integer number (661693890).

Almost surely, 2^21211303203 is an apocalyptic number.

21211303203 is a deficient number, since it is larger than the sum of its proper divisors (10550003517).

21211303203 is a wasteful number, since it uses less digits than its factorization.

21211303203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1860 (or 1857 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21211303203 its reverse (30230311212), we get a palindrome (51441614415).

The spelling of 21211303203 in words is "twenty-one billion, two hundred eleven million, three hundred three thousand, two hundred three".